- a jet-powered backpack used by astronauts to move around in space away from a spacecraft.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for jetpack
Sometimes you have to fly stunt formations with a plane and another guy in a jetpack to really get your kicks.Daredevil in a Jetpack Flies Alongside A Plane
Jack Holmes, The Daily Beast Video
December 12, 2014
And you thought the jetpack that fit in your trunk was convenient.Best James Bond Gadgets from Goldfinger, Octopussy & More (Video)
October 6, 2012